2010/7/9 Diego Jacobi <jacobidi...@gmail.com>:
> Hi.
>
> As you may know, i am working in a device using an TUSB3410 with my
> own firmware.
>
> Most is working.
> I plug the device it logs in linux correctly and i am able to detach
> the driver and make usb requests with pyusb.
>
> The problem comes when it has deadtime between calls then i get the
> next message in dmesg:
>
> usb 3-2: usbfs: process 7564 (python) did not claim interface 0 before use
>
> I can not find any method for claiming interface in pyusb. Is there one?
PyUSB 1.0 manages interface claiming automatically, but it can only do
so if all stuff is done through PyUSB. It interface is released
outside
PyUSB, it cannot figure it out. Also, this might be a bug in PyUSB.
>
> Some more details:
>
> I made a class to handle the requests (capafisica) and a test scenario:
>
> if __name__ == '__main__':
> fisica = capafisica()
> fisica.logging = fisica.LOGGING_DEBUG
> while raw_input("Presione una tecla")>0:
> fisica.try_start()
> fisica.test()
> fisica.set_gpio(0xFF,mask=0x0C)
> fisica.get_gpio()
> fisica.try_send("Hello World!")
> print fisica.try_recv()
>
>
> When i press a key it launches the set of functions and all works
> correctly. IF i press a key again, then most of them fails, i may say,
> randomly. AND this error message in dmesg appears.
>
> However if i edit the test scenario to:
>
> if __name__ == '__main__':
> fisica = capafisica()
> fisica.logging = fisica.LOGGING_DEBUG
> while raw_input("Presione una tecla")>0:
> fisica.try_start()
> fisica.test()
> fisica.set_gpio(0xFF,mask=0x0C)
> fisica.get_gpio()
> fisica.try_send("Hello World!")
> print fisica.try_recv()
> fisica.try_start()
> fisica.test()
> fisica.set_gpio(0xFF,mask=0x0C)
> fisica.get_gpio()
> fisica.try_send("Hello World!")
> print fisica.try_recv()
> fisica.try_start()
> fisica.test()
> fisica.set_gpio(0xFF,mask=0x0C)
> fisica.get_gpio()
> fisica.try_send("Hello World!")
> print fisica.try_recv()
> fisica.try_start()
> fisica.test()
> fisica.set_gpio(0xFF,mask=0x0C)
> fisica.get_gpio()
> fisica.try_send("Hello World!")
> print fisica.try_recv()
>
>
> Then all the calls works.
> In that way i discard that can be a problem in my firmware. Well, i do
> not discard it completely, but i need to know how to "claim the
> interface"
>
>
>
> Thanks
> Diego
>
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--
Best Regards,
Wander Lairson Costa
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